.TH std::basic_string_view::size,std::basic_string_view::length 3 "2024.06.10" "http://cppreference.com" "C++ Standard Libary"
.SH NAME
std::basic_string_view::size,std::basic_string_view::length \- std::basic_string_view::size,std::basic_string_view::length

.SH Synopsis
   constexpr size_type size() const noexcept;    \fI(since C++17)\fP
   constexpr size_type length() const noexcept;  \fI(since C++17)\fP

   Returns the number of CharT elements in the view, i.e. std::distance(begin(),
   end()).

.SH Parameters

   \fI(none)\fP

.SH Return value

   The number of CharT elements in the view.

.SH Complexity

   Constant.

.SH Example


// Run this code

 #include <iostream>
 #include <string_view>

 // Print a string surrounded by single quotes, its
 // length and whether it is considered empty.
 void check_string(std::string_view ref)
 {
     std::cout << std::boolalpha
               << "'" << ref << "' has " << ref.size()
               << " character(s); emptiness: " << ref.empty() << '\\n';
 }

 int main(int argc, char **argv)
 {
     // An empty string
     check_string("");

     // Almost always not empty: argv[0]
     if (argc > 0)
         check_string(argv[0]);
 }

.SH Possible output:

 '' has 0 character(s); emptiness: true
 './a.out' has 7 character(s); emptiness: false

.SH See also

   empty    checks whether the view is empty
            \fI(public member function)\fP
   max_size returns the maximum number of characters
            \fI(public member function)\fP
   size     returns the number of characters
   length   \fI(public member function of std::basic_string<CharT,Traits,Allocator>)\fP

